greenhouse exhaust fan

An alternate system runs on the fog or good mist injected into the intake air stream. Although a number of commercial systems can be found, growers can assemble and install their own system using a high pressure piston pump and fog nozzles. The basic components are proven in Fig. 1. A two-stage system managed by a two- stage thermostat enables more water to be employed on excessively warm, bright days. Temperature settings ought to be 5-10°F apart.

Algae growth in the pads can become a problem that will decrease the effectiveness of the machine and result in accelerated deterioration of the pads. The addition of an algaecide to the drinking water Greenhouse Exhaust Fan supply can help in control.

It is desirable, especially in hard water areas, to add a wetting agent to the drinking water to obtain more uniform wetting of the pads. A commercial materials or liquid home detergent at the rate of 2 tablespoons per 100 gallons can be used.

Drinking water for the pads ought to be clean and lower in mineral content to avoid clogging and coating of the pads. A pump, pipes and gutters are used to recirculate the drinking water. A flow rate 113 gallon each and every minute per linear foot of pad system should be provided to assure adequate wetting.

In the most typical cooling system (fan and pad), the fans draw air through wet pads that extend the length of one endwall or sidewall. Aspen and coated cellulose are normal pad materials that always have life of 1 to 3 years. Approximately one sq . foot of pad are is needed for 20 square foot of floor area.